Re: [XeTeX] misaligned math if \smash used in subscripts

[jfbu]

Le 14/02/2017 à 15:42, Herbert Schulz a écrit :
> 
>> On Feb 14, 2017, at 2:36 AM, jfbu  wrote:
>>
>> Hi,
>>
>> just to point out that there is interesting effect if the
>> very first \smash. is simply replaced by an x
>>
>> \hrule
>> $$
>> \hbox{$\left)\vbox to15pt{}\right.$}_{x} % or also _{\hbox{x}}
>> \hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
>> \hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
>> $$
>> \hrule
>>
>> Jean-François
> 
> 
> Howdy,
> 
> I only see a single sub-scripted x from the first line. This is with a fully 
> updated TeX Live 2016 originally installed by the MacTeX package.
> 

Hi Herb

I should have reproduced David's lines selecting an OpenType font

\font\m= "[latinmodern-math.otf]/OT:script=math;language=DFLT;" at 10pt
\font\sm= "[latinmodern-math.otf]/OT:script=math;language=DFLT;" at 7pt
\font\ssm= "[latinmodern-math.otf]/OT:script=math;language=DFLT;" at 5pt

\textfont0=\m
\scriptfont0=\sm
\scriptscriptfont0=\ssm


\Umathcode`.= 0 0 `.


The code snippet

>> \hrule
>> $$
>> \hbox{$\left)\vbox to15pt{}\right.$}_{x} % or also _{\hbox{x}}
>> \hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
>> \hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
>> $$
>> \hrule

in my post was supposedly following those lines


The effect is that the presence of the x changes the size of the second
parenthesis, Also tested on TL2016.

best

Jean-François





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Re: [XeTeX] misaligned math if \smash used in subscripts

[Herbert Schulz]

> On Feb 14, 2017, at 2:36 AM, jfbu  wrote:
> 
> Hi,
> 
> just to point out that there is interesting effect if the
> very first \smash. is simply replaced by an x
> 
> \hrule
> $$
> \hbox{$\left)\vbox to15pt{}\right.$}_{x} % or also _{\hbox{x}}
> \hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
> \hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
> $$
> \hrule
> 
> Jean-François


Howdy,

I only see a single sub-scripted x from the first line. This is with a fully 
updated TeX Live 2016 originally installed by the MacTeX package.

Good Luck,

Herb Schulz
(herbs at wideopenwest dot com)




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Re: [XeTeX] misaligned math if \smash used in subscripts

[Ulrike Fischer]

Am Tue, 14 Feb 2017 00:41:48 + schrieb David Carlisle:

> The following first reported at the unicode-math github
> https://github.com/wspr/unicode-math/issues/383
> but the problem can be seem with plain tex.
> 
> 
> In the tex below there are six repeated instances of a subscripted bracket
> they should all be the same but the first one is misaligned.

It works ok on miktex. See
http://chat.stackexchange.com/transcript/message/35423834#35423834
for my output. (On texlive I get the wrong one too).

Imho it is part of a number of questions and bug reports regarding
leaking fontdimens (e.g.
https://sourceforge.net/p/xetex/bugs/75/#b012) which should be fixed
in the development version.

-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/



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Re: [XeTeX] misaligned math if \smash used in subscripts

[jfbu]

Hi,

just to point out that there is interesting effect if the
very first \smash. is simply replaced by an x

\hrule
$$
\hbox{$\left)\vbox to15pt{}\right.$}_{x} % or also _{\hbox{x}}
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
$$
\hrule

Jean-François


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[XeTeX] misaligned math if \smash used in subscripts

[David Carlisle]

The following first reported at the unicode-math github
https://github.com/wspr/unicode-math/issues/383
but the problem can be seem with plain tex.


In the tex below there are six repeated instances of a subscripted bracket
they should all be the same but the first one is misaligned.

It appears to be a misbehaviour of \mathchoice as if I change the size of the
scriptscript font the effect changes, even though there is no visible
script script text.

The attached images show the output with the file as below and with
the scriptscript font changed to

at 25pt

I've tried it with fam 0,1,2 all set up as the same font, or as here
with just fam0
using a opentype font.

David


\font\m= "[latinmodern-math.otf]/OT:script=math;language=DFLT;" at 10pt
\font\sm= "[latinmodern-math.otf]/OT:script=math;language=DFLT;" at 7pt
\font\ssm= "[latinmodern-math.otf]/OT:script=math;language=DFLT;" at 5pt

\textfont0=\m
\scriptfont0=\sm
\scriptscriptfont0=\ssm


\Umathcode`.= 0 0 `.

\hrule
$$
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
$$
\hrule
$$
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
\hbox{$\left)\vbox to15pt{}\right.$}_{\smash.}
$$
\hrule


\bye


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